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Emmetropisation in human infancy: rate of change is related to initial refractive error
K J Saunders1, J M Woodhouse, C A Westall
1Department of Vision Sciences, Glasgow Caledonian University, U.K.
Insights
Infant refractive error recovery is faster with higher hyperopia and astigmatism. This suggests that significant refractive errors in the second year of life may need correction for better visual development.
Area of Science:
- Ophthalmology
- Developmental Biology
- Pediatric Optometry
Background:
- Animal studies indicate a correlation between the degree of induced ametropia and the rate of recovery.
- Understanding emmetropization in human infants is crucial for early detection and intervention of visual impairments.
Purpose of the Study:
- To investigate the rate of emmetropization in human infants.
- To determine if the rate of emmetropization correlates with the initial level of refractive error, specifically hyperopia and astigmatism.
Main Methods:
- Longitudinal study of 22 human infants.
- Refraction assessed using near retinoscopy at 6 months and again between 12-17 months of age.
- Regression analysis to evaluate the relationship between refractive error levels and emmetropization rates.
Main Results:
- Emmetropization occurred significantly faster in infants with higher levels of hyperopia (P < 0.005).
- Emmetropization was also more rapid in the presence of higher astigmatism (P = 0.001).
- No subjects in the study were myopic.
Conclusions:
- The findings in human infants align with previous animal study observations.
- High hyperopia and astigmatism that persist without reduction into the second year of life may warrant corrective intervention.
- Early detection and management of refractive errors are essential for optimal visual development in infants.
Abstract:
Animal studies show that the rate of recovery from experimentally induced refractive errors is related to the level of ametropia induced. The present study examined the rate of emmetropisation occurring in a sample of 22 human infants refracted by near retinoscopy during the first six months of life and then again between 12 and 17 months old. None of the subjects were myopic. Regression analysis revealed that emmetropisation occurred more rapidly in the presence of high refractive errors (P < 0.005 and P = 0.001 for hyperopia and astigmatism respectively). These data confirm the findings of the animal studies and suggest that non-reducing hyperopia and astigmatism in the second year of life may require correction.